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Diffstat (limited to 'docs/narr')
| -rw-r--r-- | docs/narr/viewconfig.rst | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/docs/narr/viewconfig.rst b/docs/narr/viewconfig.rst index 241ce62b5..388371a0d 100644 --- a/docs/narr/viewconfig.rst +++ b/docs/narr/viewconfig.rst @@ -557,6 +557,33 @@ form of :term:`declarative configuration`, while :meth:`pyramid.config.Configurator.add_view` is a form of :term:`imperative configuration`. However, they both do the same thing. +Inverting Predicate Values +~~~~~~~~~~~~~~~~~~~~~~~~~~ + +You can invert the meaning of any predicate value by wrapping it in a call to +:class:`pyramid.config.not_`. + +.. code-block:: python + :linenos: + + from pyramid.config import not_ + + config.add_view( + 'mypackage.views.my_view', + route_name='ok', + request_method=not_('POST') + ) + +The above example will ensure that the view is called if the request method +is *not* ``POST``, at least if no other view is more specific. + +This technique of wrapping a predicate value in ``not_`` can be used anywhere +predicate values are accepted: + +- :meth:`pyramid.config.Configurator.add_view` + +- :meth:`pyramid.view.view_config` + .. index:: single: view_config placement |